You don't want to leave your dial-up account password in the WvDial configuration file because it is stored in plaintext.
Add the AskPassword = yes
option to your WvDial configuration file, like this:
[Dialer Defaults] Modem = /dev/ttyS3 Baud = 115200 Init1 = ATZ Init2 = ATQ0 V1 E1 &C1 &D2 +FCLASS=0 ISDN = 0 Modem Type = Analog Modem Dial Attempts = 10 [Dialer ISP1] Stupid Mode = on Phone = 1234567 Username = alrac Ask Password = yes Idle Seconds = 600
Then, you'll be prompted for your password during login.
This is not suitable for a dial-up server, unless you enjoy scampering to the server and entering a password every time someone needs to go online. It adds a bit of protection for users who do not have control over who uses their computers.
man 1 wvdial
man 5 wvdial.conf
man 8 pppd